The correct answer is B. An underground lake
Explanation:
Sound moves more slowly in liquids or gases than in solids, in which particles are together. Additionally, the speed of sound is measured in meters per second or m/s. In this context, if the speed of a sound wave reduced from 4,000 m/s to 1,500 m/s while traveling through the surface of Earth, which is solid, it is likely the cause is a change in the medium the wave is going through.
Moreover, the average speed of sound in air is below 400 m/s, this suggests the sound was not traveling through an open cavity. However, the speed in liquids such as water is around 1480 m/s, this is quite similar to the second speed registered. According to this, the sound wave slowed because it was traveling through a liquid medium; therefore, the answer is an underground lake.
False. They would be used more efficiently
Explanation:
The Industrial Revolution meant that poverty became concentrated in urban areas instead of the countryside. ... It led to contestation of laissez faire economics since it was associated with the emergence of that poverty. Socialist thinkers contested capitalism both in Europe and in the USA.
One of the reasons why the Glorious Revolution in England was unusual in comparison to political developments in France, Spain, and Russia was because "<span>While the French, Spanish, and Russian monarchies were becoming more absolute, the Glorious Revolution created a limited monarchy," since the main goal of the war was to bring more power to the people through Parliament. </span>
